How to Troubleshoot and Fix No Sound on Yamaha PSR S910 with Mods

[@SaraKodak-wv4xt]

hello, I have organo ws2 professional, when I turn it on, some lights come on, then I turn it off and turn it on again, the lights go away, as well as the lights of the volume numbers, while the screen stays on, but it is blank without numbers and letters, and the keyboard does not work

[@SaraKodak-wv4xt]

can you more or less tell me where this defect comes from?